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What is the value of a resistor?
A resistor is a device that opposes the flow of electrical current. The bigger the value of a resistor the more it opposes the current flow. The value of a resistor is given in ohms and is often referred to as its ‘resistance’.
How do you write the value of a resistor?
Calculating Resistor Values For example, a resistor has the following coloured markings; Yellow Violet Red = 4 7 2 = 4 7 x 102 = 4700Ω or 4k7 Ohm. The fourth and fifth bands are used to determine the percentage tolerance of the resistor.
What is the purpose of a resistor?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
How do you determine the value of a resistor using color code?
Reading and Determining the Resistor Value Hold the resistor with the gold or silver band to the right and read the color codes from the left to the right. Select the color codes from the bands on the resistor. Read the colors from left to right. The resistance value based on the color code provided is now displayed.
What are the most commonly used resistor values?
The most common series are: E6 20% E12 10% E24 5% (also available with 1%) E48 2% E96 1% E192 0.5% (also used for resistors with 0.25% and 0.1%).
What is the standard value of a resistor?
Typical resistor values lie in the range from 100 &OHgr to 10 k&OHgr with a matching tolerance of ±0.2% and a temperature coefficient of resistance of ±10 to ±200 ppm/°C. Diffused resistors are based upon the same fabrication geometry and techniques used to produce the active transistors on the silicon chip or die.
How are resistor values measured?
You can measure the actual value of a specific resistor using a device called a multimeter . For example, when you use a multimeter to measure a 470 Omega resistor with a 5 percent tolerance, you might found that the actual value is 481 Omega.
How do resistor values work?
The value of resistor R1 controls how much current you want to flow from VCC, through the button, and then to ground. When the button is not pressed, the input pin is pulled high. The value of the pull-up resistor controls the voltage on the input pin. For condition 1, you don’t want the resistor’s value too low.